JP2007173455A - Winding component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a winding member which obtains a plurality of outputs by at least two pairs of coil assemblies containing an I-type core therein, respectively, and can obtain a uniform output from mutual coils without being affected by a dimensional error of the I-type core or the like. <P>SOLUTION: At least two pairs of assemblies comprise bobbins 10, 11 which are composed of a material having an electric insulating property, and have winding parts 13, 18 containing a wound conductor wire in a coiled state; I-type cores 15 which are inserted into the bobbins 10, 11 in an axial direction and protrude both ends from the winding part; and U-type cores 25 which are arranged along outer peripheries of the bobbins 10, 11 and have both ends which are magnetically connected to each end of the I-type cores 15, respectively, thereby forming a closed magnetic circuit together with the I-type cores 15. At least the two pairs of assemblies are disposed substantially parallel to the mutual I-type cores 15, and also form a gap between the ends of the U-type core 25 with parallel arrangement. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to winding components such as transformers and inductors used in various electronic devices and electrical devices.

  In recent years, a plurality of cold-cathode tubes are used as light sources for screen irradiation in liquid crystal displays (hereinafter referred to as LCDs) used as display devices such as personal computers. In order to discharge and light these cold cathode tubes, an inverter transformer which is one type of the above-described winding components is used.

  In this inverter transformer, an AC voltage converted from a DC input voltage in a transmission circuit is input to a primary coil, and this is boosted to 1000 to 2000 V in a secondary coil and output to the cold cathode tube. One having two sets of secondary coils for lighting the cold-cathode tubes at the same time or differentially is often used.

FIG. 6 shows a conventional inverter transformer of this type found in Patent Document 1 below.
In this inverter transformer, the first and second bobbins 1 and 2 are wound with the conductive wires to be the secondary coils 3 and 4, respectively, and the I-shaped cores 5 and 6 are inserted into the respective core insertion holes. And the second bobbins 1 and 2 are integrated, a conducting wire serving as a common primary coil 7 is wound between the two, and a rectangular core 8 surrounding the primary coil 7 and the secondary coils 3 and 4 The I-shaped cores 5 and 6 are magnetically coupled.

According to this inverter transformer, one cold core 8 is provided in comparison with the case where two cold cores are provided corresponding to the I-shaped cores 5 and 6 in driving two cold cathode tubes. Therefore, the number of parts can be reduced, the apparatus can be reduced in size, and the apparatus can be reduced in cost.
JP 2002-353004 A

  By the way, in the above conventional inverter transformer, since the common lo-shaped core 7 is magnetically connected to the two I-shaped cores 5 and 6, the first and second bobbins Due to dimensional errors that occur during the manufacture or assembly of the core insertion holes formed in 1 and 2 and the I-shaped cores 5 and 6 or the R-shaped core 8, the said R-shaped core 8 and the two I-shaped cores 5 , 6 has a problem in that the magnetic coupling is different.

For example, as shown in FIG. 5, when an error occurs in the thickness dimension of the I-shaped cores 5 and 6, as shown in FIG. As a result, non-uniform gaps S ₁ and S ₂ are formed between both I-shaped cores 5 and 6, or as shown in FIG. A phenomenon may occur in which sufficient contact cannot be obtained with one I-shaped core 5. As a result, the secondary coils 3 and 4 have a problem that a uniform output voltage cannot be obtained.

  Further, when the secondary coils 3 and 4 are differentially output with a high voltage, current flows through the I-shaped cores 5 and 6 with insufficient contact, and the I-shaped cores 5 and 6 have particularly low specific resistance. When a Mn—Zn-based material is used, there is a possibility that dielectric breakdown may occur, and it is difficult to secure a sufficient breakdown voltage.

  The present invention has been made in view of such circumstances, and a winding member that obtains a plurality of outputs by at least two sets of coil assemblies each including an I-type core is affected by dimensional errors of the I-type core and the like. It is an object of the present invention to provide a winding member that can obtain a uniform output from each other coil.

  In order to solve the above problems, a winding member according to the present invention described in claim 1 is made of a material having electrical insulation, and a bobbin having a winding portion in which a conducting wire is wound in a coil shape, An I-type core that is inserted into the bobbin in the axial direction of the coil and has both ends projecting from the winding part, and is disposed along the outer periphery of the bobbin, and both ends are each end of the I-type core. And at least two sets of coil assemblies having a U-shaped core that forms a closed magnetic circuit together with the I-type core by being magnetically connected to each other. A gap is formed between the end portions of the mold core and is arranged in parallel.

  The invention according to claim 2 is the invention according to claim 1, wherein the winding portion is a first winding portion around which the conducting wire constituting the primary coil is wound, and a secondary coil. And a second winding portion around which the conducting wire is wound, and the first winding portion of the adjacent coil assembly is the primary coil common to both of them. Is wound around.

  Furthermore, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the two sets of coil assemblies located on both sides of the arrangement direction are the coil assemblies in which the U-shaped cores are adjacent to each other. It is arrange | positioned along the outer periphery on the opposite side.

  According to the winding member according to any one of claims 1 to 3, at least two sets of coil assemblies in which both ends of the U-shaped core are magnetically connected to both ends of the I-shaped core inserted through the bobbin. Since a closed magnetic circuit is formed in each coil assembly by forming a gap between the ends of the U-shaped cores and arranging them in parallel, the dimensions of the I-shaped cores in each coil assembly When an error occurs, a uniform output can be obtained from each coil without being affected by the error. Further, since there is no electrical coupling between the coil assemblies, stable output and safe insulation can be ensured even when a high voltage output from the coil is taken out differentially.

  In this case, according to the invention described in claim 2, the winding member is adjacent when the primary coil and the secondary coil are wound around the winding portion like a transformer. If the primary coil common to both of them is wound around the first winding portion of the coil assembly, the above-mentioned I-type in each coil assembly is obtained by making the primary coil to be an exciting coil into one. A uniform magnetic flux can be generated in a closed magnetic circuit composed of a core and a U-shaped core, which is preferable.

  By the way, generally, when a closed magnetic circuit is formed by an I-type core housed in a bobbin and a U-type core disposed on the outer periphery of the bobbin, the U-type core side is directed toward the bobbin side where the I-type core is located. Magnetic flux leakage increases. For this reason, when various electronic components are arranged close to each other around the winding member, the influence of leakage magnetic flux from the coil assembly to the outside cannot be ignored.

  In this regard, according to the third aspect of the present invention, in the two sets of coil assemblies located on both sides in the arrangement direction of the plurality of coil assemblies, the U-shaped cores are arranged opposite to the adjacent coil assemblies. Since the magnetic flux leakage from the coil assembly is canceled out toward the inside of the winding member, the influence of the leakage magnetic flux to the outside described above can be reduced. it can.

1 to 3 show an embodiment in which a winding component according to the present invention is applied to an inverter transformer for lighting of two cold cathode tubes serving as a backlight of an LCD.
In this inverter transformer, a bobbin is formed by one first bobbin 10 and two second bobbins 11. First, the first bobbin 10 includes a first winding portion 13 around which a conducting wire for forming the primary coil 12 is wound, and one axial end of the primary coil 12 in the first winding portion 13. A terminal mounting portion 14 formed with a terminal 14a, which is formed on the side and to which the end of the conducting wire of the primary coil 12 is connected, is integrally formed of a synthetic resin having electrical insulation.

  The first bobbin 10 has a width dimension approximately twice that of the second bobbin 11, and an I-type core 15 made of a ferrite core is formed in the first winding portion 13 in the width direction. Two holes 16 to be inserted are formed so as to penetrate the winding portion 13 in the axial direction and open at both ends. The terminal mounting portion 14 is formed with a common groove portion 17 that is continuous with each hole portion 16 and opens at the end of the terminal mounting portion 14. Here, the groove portion 17 is formed to have a depth that is a little less than a half of the thickness of the I-type core 15.

  On the other hand, the second bobbin 11 is arranged on the one end side in the axial direction of the second winding portion 19 having a rectangular tube shape around which a conducting wire forming the secondary coil 18 is wound. Similarly, the terminal mounting portion 20 in which the terminal 20a to which the end of the conducting wire of the secondary coil 18 is connected is integrally molded with a synthetic resin having electrical insulation.

  A hole 21 is formed in the second winding portion 19 so as to communicate with the hole 15 and through which the I-type core 15 is inserted. In addition, a plurality of partition plates 22 for preventing creeping discharge in the high-voltage secondary coil 18 are integrally formed on the outer peripheral portion at equal intervals in the axial direction, and a flange portion 23 is formed at the end portion. Is formed. On the other hand, the terminal mounting portion 20 is formed with a groove portion 24 that is continuous with the hole portion 21, and this groove portion 24 is not recessed at the end portion of the terminal mounting portion 20 and is closed by a locking wall 24 a. Is formed.

  The two sets of the second bobbins 10 have holes 21 formed in the second winding portion 19 and holes 16 formed in the first winding portion 13 of the first bobbin 10. And the flange portion 23 is placed on the end surface of the first bobbin 10, and the I-type core 15 is inserted into the holes 16 and 21 in the first and second bobbins 10 and 11. Thus, the first bobbin 10 is integrated with the first bobbin 10 in a state of being arranged in parallel.

  Here, the I-type core 15 is formed in a rectangular plate shape that can be loosely inserted into the holes 16 and 21 of the first and second bobbins 10 and 11, and the terminal mounting portion of the first bobbin 10. 14 is inserted into the hole 16 from the groove 17 side, and the tip thereof is inserted into the locking wall 24a of the groove 24 formed in the terminal mounting portion 20 through the hole 21 in the second bobbin 11. It is positioned by abutting.

  Further, on the outer circumference of the first and second bobbins 10 and 11, there are provided two U-shaped cores 25 made of ferrite cores and having bent side portions 25b bent at 90 ° C. at both ends of the central side portion 25a. ing. These U-shaped cores 25 are formed in the terminal mounting portion 14 of the first bobbin 10 with the central side portions 25a extending along the outer peripheral sides of the first and second bobbins 10 and 11, respectively. It is positioned by engaging with the shallow groove portion 14b, and is magnetically connected to both end portions of the I-type core 15 in the step portion 25c formed on the lower surface of both bent side portions 25b. These two U-shaped cores 25 are arranged so that a gap F is formed between the opposing bent side portions 25a.

  As a result, the first bobbin 10, one second bobbin 11, the I-type core 15 inserted through the first bobbin 10, and the U-type core 25 whose both ends are magnetically connected to the I-type core 15, A bobbin assembly is configured, and includes a first bobbin 10, the other second bobbin 11, an I-type core 15 inserted through them, and a U-type core 25 having both ends magnetically connected to the I-type core 15. The other bobbin assembly is configured. Each bobbin assembly is formed with an independent closed magnetic circuit by an I-type core 15 and a U-type core 25.

  According to the inverter transformer having the above-described configuration, two sets of both ends of the U-type core 25 are magnetically connected to both ends of the I-type core 15 inserted through the first and second bobbins 10 and 11. Since an independent closed magnetic circuit is formed in the coil assembly, even if a dimensional error occurs in the I-type core 15 or the like in each coil assembly, uniform output from each other coil is not affected by this. Obtainable.

  For example, as shown in FIGS. 4A and 4B, even when the thickness dimension of one I-type core 15 is made thinner than the thickness dimension of the other I-type core 15, the U-type Since the core 25 is magnetically connected independently to each I-type core 15, it is possible to reliably form a magnetic connection between each I-type core 15 and the U-type core 25. In addition, since there is no electrical coupling between the coil assemblies, stable output and safe insulation can be ensured even when the high voltage output from the coil is taken out differentially.

  In addition, since the primary coil 12 common to both is wound around the first winding portion 13 of the common first bobbin 10 with respect to the adjacent second bobbin 11, By using one primary coil 12 as described above, a uniform magnetic flux can be generated in the closed magnetic circuit constituted by the I-type core 15 and the U-type core 25 in each coil assembly.

  Furthermore, since the central side portion 25a of the U-shaped core 25 in the two sets of coil assemblies is arranged along the outer periphery on the opposite side to the adjacent coil assemblies, the leakage of magnetic flux from the coil assemblies is opposed to each other. By canceling these inward, the influence of the leakage magnetic flux to the outside can be reduced.

It is a figure which shows the 1st Embodiment of this invention, (a) is a top view, (b) is a front view, (c) is a side view. It is a figure which shows the shape of the 1st bobbin of FIG. 1, (a) is a rear view, (b) is a top view, (c) is a front view. It is an exploded view which shows the assembly state of FIG. It is a figure which shows the contact state of the I-type core and U-type core of FIG. It is a figure which shows the contact state of the I-shaped core and the square-shaped core in the conventional inverter transformer. It is a disassembled perspective view which shows the conventional inverter transformer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 1st bobbin 11 2nd bobbin 12 Primary coil 13 1st coil | winding part 14, 20 Terminal mounting part 14a, 20a Terminal 15 I-type core 16, 21 Hole part 25 U-type core 25a Central side part 25b Bending Side

Claims (3)

  A bobbin made of a material having electrical insulating properties and having a winding portion in which a conductive wire is wound in a coil shape, and inserted into the bobbin in the axial direction of the coil so that both ends protrude from the winding portion An I-type core and a U-type core disposed along the outer periphery of the bobbin and having both ends thereof magnetically connected to the respective ends of the I-type core to form a closed magnetic circuit together with the I-type core At least two sets of coil assemblies having the I-type cores substantially parallel to each other and arranged in parallel with a gap formed between the ends of the U-type cores. Winding parts to do. The winding portion has a first winding portion around which the conducting wire constituting the primary coil is wound, and a second winding portion around which the conducting wire constituting the secondary coil is wound. And
2. The winding component according to claim 1, wherein the adjacent coil assembly is wound with the conductive wire serving as the primary coil common to both of the first winding portions.   The two sets of coil assemblies located on both sides in the arrangement direction are characterized in that each of the U-shaped cores is arranged along an outer periphery opposite to the adjacent coil assembly. Winding parts as described in.

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